The latest regulatory information isDraTraPlease see.

PDF version [PDF:999KB]

NEXCO EAST Saitama Construction Office (Saitama City, Saitama Prefecture) will be implementing a night-time road closure on the inner and outer loop of the C4 Ken-o Expressway (hereinafter referred to as the "Ken Ken-O Road") between Satte Interchange (hereinafter referred to as the "IC") and Sakai-Kogane Interchange in order to carry out lane switching work and pavement repair work in connection with the widening to four lanes.
Please note that the lanes will change between Satte IC and Goka IC after the road closure is lifted, so please be careful when driving (see Appendix 1 [PDF: 169KB]).
We apologize for any inconvenience this may cause, and we ask for your understanding and cooperation in allowing yourself plenty of time when heading out.

1. Closed section, date and time

• Attached to each line C4 The indications such as indicate the route number (numbering) of Expressway.

2. Detour

For detours, please refer to Appendix 2 [PDF: 488KB].
The detour will increase travel time, so please allow yourself plenty of time when traveling.

3. Regarding transit adjustments due to suspension of traffic

For customers who exit Expressway due to a road closure, detour around the closed section, then re-enter and transfer in the forward direction, a "transfer adjustment" will be implemented in which the toll fee will be adjusted according to the section used. (See Appendix 3 [PDF: 194KB])

Transfer IC

1. Tohoku Expressway ・ ・ ・ Tohoku Expressway
2. Limited to ETC vehicles of all models (12m or less)
3. Limited to ETC vehicles of ordinary size and below

How to use transit adjustment

ETC customers

• For customers using ETC, please drive wirelessly at designated outflow ICs, and also wirelessly drive at re-inflow ICs. (Transfer certificates are not issued for ETC vehicles)
• ETC time zone discount will be applied, considering the transited journey as one.
  Toll charges are adjusted at the time of billing, so they may differ from those displayed at the toll gate.
• Insert the same ETC card for all journeys and pass through the ETC lane at the tollgate.

Customers such as cash

• Customers paying with cash, etc. should receive a "transfer certificate" at the outflow designated IC, then take a "transit ticket" at the re-inflow IC, and then take the "transition certificate" at the toll booth where they pay the toll for the first time. Please hand over your ``book'' and ``traffic ticket.''

Common to ETC and cash customers

• If the suspension of traffic is released after the outflow designated IC is released, the fare will be adjusted even if it is re-introduced from the IC (including the outflow designated IC) in the closed road section in the forward direction.

Four. Construction overview

Ken-O Road　Lane switching work (installation of temporary road surface markings, relocation of emergency lights, etc.) and pavement repair work will be conducted between the Satte IC and the Sakai-Koga IC at Ken-O Road in conjunction with the four-lane conversion.
Since the section where these works will be carried out is one lane in each direction and cannot be constructed with normal lane restrictions, it will be necessary to close the section to traffic. Therefore, to avoid inconveniencing customers as much as possible, we will close the road during weekday evenings when traffic volume is low, and conduct construction work in an intensive and efficient manner.
We ask for your understanding and cooperation as this work is necessary for the safe and comfortable use of Expressway by our customers.

Five. How to obtain traffic information

(1) Guidance by distribution / posting

• Notice signs, posters and leaflets will be posted at toll booths and rest facilities nearby.
• A banner will be posted on the overpass on the Expressway.

(2) Road traffic information that can be obtained before going out

• NEXCO東日本お客さまセンター（24時間オペレーターが対応）
  ナビダイヤル：0570-024-024
  または：03-5308-2424
• NEXCO EAST Expressway Traffic Information Site "DraTra"
  Real-time information

  [PC] https://www.drivetraffic.jp/
  [Mobile] http://m.drivetraffic.jp/

  Construction regulation information

  [PC] https://www.drivetraffic.jp/construction-regulation
• 日本道路交通情報センター（JARTIC）道路交通情報
  全国共通ダイヤル　050-3369-6666
  （携帯電話短縮ダイヤル　#8011）
  ※全国どこからでも最寄りの情報センターに接続します。
  全国・関東甲信越情報　050-3369-6600
  埼玉情報　050-3369-6611
  茨城情報　050-3369-6608
  【PC】https://www.jartic.or.jp/

(3) Road traffic information available while using the Expressway

• Road information board
• Highway radio (AM1620kHz)
  The highway radio section is indicated by signs on the Expressway.
• Highway Information Terminal
  We will inform you of road information in an easy-to-understand manner by the monitor screens installed in SA / PA.
• VICS
  You can get road traffic information with VICS-compatible car navigation and other on-board devices.

• Information is also distributed on official X (formerly Twitter) and LINE accounts.
  [X (old Twitter)]
  "NEXCO EAST (Kanto)" (@e_nexco_kanto) Real-time traffic information
  “NEXCO EAST (Kanto Construction Regulations)” (@e_nexco_kanto_k) Decision to implement construction regulations
  [LINE]
  "NEXCO EAST" (@e-nexco) Road closures and weather information